Please use the table below to select the correct etchant for your titanium alloy.

Grade of Titanium:  Etchant to Use: 
Unknown grade titanium alloys Kroll’s
Beta C
CP Ti (Commercially pure titanium, Grades 1, 2, 3, 4)
Ti 15-3
Ti 21S (Beta 21S)
Ti 3-2.5 (Ti 3Al-2.5V, Grade 9)
Ti 5-2.5 (Ti 5Al-2.5Sn, Grade 6)
Ti 6-2-4-2 (Ti 6Al-2Sn-4Zr-2Mo)
Ti 6-4 (Ti 6Al-4V, Grade 5)
Ti 6-6-2 (Ti 6Al-6V-2Sn)
Alpha case detection First Kroll’s then 2% HF
Nitinol, Ni-Ti alloy ASTM 151
Macro-etching titanium AWS D1.9 Titanium weld etch
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